One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,10,14)(7,15,17,11)(8,12,9,13)(16,20,18,19)(21,22,26,30)(23,27,28,24)(25,29,33,36)(31,34,35,32)(5,7)(6,11)(8,16)(9,18)(10,17)(12,19)(13,20)(14,15)(21,23)(22,27)(24,30)(25,32)(26,28)(29,31)(33,34)(35,36) involution — undirected(1,2,3,4)(5,8,10,9)(6,12,14,13)(7,16,17,18)(11,19,15,20)(21,24,30,23,26,27,22,28)(25,32,36,31,33,34,29,35)(5,8,10,9)(6,13,14,12)(7,16,17,18)(11,20,15,19)(21,22,26,30)(23,27,28,24)(25,29,33,36)(31,34,35,32)(5,9,10,8)(6,13,14,12)(7,16,17,18)(11,19,15,20)(21,25,22,29,26,33,30,36)(23,31,24,32,28,35,27,34)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.